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I change a user via SQL in wordpress:

SET @old_user='old_user';
SET @new_user='new_user';

UPDATE wp_users SET user_login = replace(user_login, @old_user, @new_user);
UPDATE wp_users SET user_nicename = replace(user_nicename, @old_user, @new_user);
UPDATE wp_usermeta SET meta_value = replace(meta_value, @old_user, @new_user);

However, while posting a new one, the author is still the old one, for instace,

Posted on October 3, 2015 by old_user.

I must ignore something, please guide me.

2

You probably haven't changed the display name, which is probably what is being displayed. "nicename" is used for the author's posts page url and not for display.

UPDATE wp_users SET display_name = replace(display_name, @old_user, @new_user);
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-2

best is to update it via your Phpmyadmin.. easy select your database and then select users table amd just rename what you need..

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  • 2
    Please explain exactly how one would do this, including any caveats or cautions that should be considered. – s_ha_dum Oct 10 '15 at 19:59

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